Does Fibrolytic Enzyme Level in Feedlot Cattle Affect Cattle Weight

Multiple Choice

Does fibrolytic enzyme level in feedlot cattle affect cattle weight gain, on average? Researchers randomly assigned 20 feedlot cattle to four groups, with each group being fed a diet containing a different enzyme level. Cattle weight gain (in kilograms) was recorded over the time of the study. There was no obvious deviation from Normality for these data. The findings are summarized below:
When checking the assumptions for this ANOVA test, what should we conclude?
$$\begin{array} { | l | l | l | l | } \hline \text { Enzyme level } & n & \text { mean } & \text { std. dev. } \\\hline \text { None } & 5 & 51.8 & 4.9 \\\hline \text { Low } & 5 & 55.0 & 7.8 \\\hline \text { Medium } & 5 & 67.4 & 9.6 \\\hline \text { High } & 5 & 48.8 & 7.3 \\\hline\end{array}$$

A) The assumptions are all reasonably met.
B) The assumption of equal population standard deviations is not met.
C) The assumption of independent random samples is not met.
D) None of the assumptions is met.